Health
Deep sleep can keep two big health problems at bay, new studies suggest
It might be worth working a little bit harder to get that much-desired, but often elusive, good night’s sleep.
Deep sleep clears the mind of waste just as a “dishwasher” cleans dirty plates and glasses, just-published research suggests — and there’s more.
The findings also offer insights into how sleeping pills may disrupt the “brainwashing” system — potentially affecting cognitive function for people over the long run.
ANOTHER REASON TO GET MORE SLEEP AND THIS ONE MIGHT SURPRISE YOU
Study senior author professor Maiken Nedergaard of the University of Rochester and the University of Copenhagen said norepinephrine (a neurotransmitter and hormone) triggers blood vessels to contract — generating slow pulsations that create a rhythmic flow in the surrounding fluid to carry away waste, news agency SWNS noted.
Said Nedergaard, “It’s like turning on the dishwasher before you go to bed and waking up with a clean brain. . . . We’re essentially asking what drives this process and trying to define restorative sleep based on” this “glymphatic clearance.”
“It’s like turning on the dishwasher before you go to bed and waking up with a clean brain.” (iStock)
The brain has a built-in waste removal process – the glymphatic system – that circulates fluid in the brain and spinal cord to clear out waste, according to the scientists.
The process helps remove toxic proteins that form sticky plaques linked to neurological disorders, such as Alzheimer’s disease.
But the scientists indicated that what drives the system was unclear until now, according to the study.
Is all sleep created equal? The researchers wanted to find out.
To find clues, Nedergaard and her team looked into what happens in mice when their brains sleep, as SWNS reported of the study. The team focused on the relationship between norepinephrine and blood flow during deep sleep.
TRUMP’S DAYLIGHT SAVING PLAN AND SLEEP: WHAT YOU MUST KNOW
They found that norepinephrine waves correlate to variations in brain blood volume — suggesting that norepinephrine triggers a rhythmic pulsation in the blood vessels. The researchers then compared the changes in blood volume to brain fluid flow.
The brain fluid flow fluctuates in correspondence to blood volume changes, suggesting the vessels act as pumps to propel the surrounding brain fluid to flush out waste.
During deep sleep, toxic proteins that form sticky plaques linked to neurological disorders such as Alzheimer’s disease are removed, scientists say in a new study. (iStock)
Natalie Hauglund of the University of Copenhagen and the University of Oxford, the study’s lead author, said, “You can view norepinephrine as [the] conductor of an orchestra.”
She added, “There’s a harmony in the constriction and dilation of the arteries, which then drives the cerebrospinal fluid through the brain to remove the waste products.”
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Hauglund said she wanted to understand whether all sleep is created equal.
To find out, the research team administered zolpidem, a common drug to aid sleep, to mice.
“If people aren’t getting the full benefits of sleep, they should be aware of that, so they can make informed decisions.”
They found that the norepinephrine waves during deep sleep were 50% lower in zolpidem-treated mice than in naturally sleeping mice.
Although the zolpidem-treated mice fell asleep more quickly — fluid transport into the brain dropped more than 30%, as SWNS reported.
Two new studies indicate the importance of getting a good night’s sleep — with one study saying a lack of sleep may be sabotaging the brain’s ability to keep intrusive thoughts at bay. (iStock)
The researchers say their findings, published in the journal Cell, suggest that the sleeping aid may disrupt the norepinephrine-driven waste clearance during sleep.
Hauglund said, “More and more people are using sleep medication, and it’s really important to know if that’s healthy sleep. If people aren’t getting the full benefits of sleep, they should be aware of that, so they can make informed decisions.”
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The research team said the findings likely apply to humans, who also have a glymphatic system, although it requires further testing.
Nedergaard added, “Now we know norepinephrine is driving the cleaning of the brain, we may figure out how to get people a long and restorative sleep.”
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Meanwhile, a lack of sleep may be doing more damage than just making people groggy.
It could be sabotaging the brain’s ability to keep intrusive thoughts at bay.
Anyone who suffers from sleep deprivation may find that the brain’s defense against unwanted memories is weakened, say experts. (iStock)
Another new study, this one published in the Proceedings of the National Academy of Sciences, found that sleep deprivation weakens the brain’s defense against unwanted memories, allowing them to flood the mind, according to the New York Post.
“We show that sleep deprivation disrupts prefrontal inhibition of memory retrieval, and that the overnight restoration of this inhibitory mechanism is associated with time spent in rapid eye movement (REM) sleep,” the scientists said.
Health
How much red meat is too much? Experts weigh in on food pyramid updates
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The release of an updated food pyramid this week has sparked mixed reactions from doctors and dietitians.
One of the most noteworthy shifts in the 2025-2030 Dietary Guidelines for Americans — announced by HHS officials during a Jan. 7 press conference at the White House — is a greater emphasis on “high-quality proteins,” including red meat and eggs, as well as full-fat dairy.
The new guidelines focus on “real, whole, nutrient-dense foods,” and a dramatic reduction in highly processed foods, added sugars, refined carbohydrates and unhealthy fats.
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“Protein and healthy fats are essential and were wrongly discouraged in prior dietary guidelines,” Health Secretary Robert F. Kennedy Jr. said during the press conference. “We are ending the war on saturated fats.”
Nick Norwitz, a Harvard- and Oxford-trained researcher known for his work in metabolic health, shared his reaction to the new guidelines.
The release of an updated food pyramid this week has sparked mixed reactions from doctors and dietitians. (realfood.gov)
Despite how the new pyramid is presented, he noted, the actual guidelines for saturated fat consumption haven’t changed, as they still state that, “in general, saturated fat consumption should not exceed 10% of total daily calories.”
The intake of unprocessed whole foods rich in saturated fat, especially dairy fat, tends to be associated with improved health outcomes, according to Norwitz.
RED MEAT CAN HELP YOUR MOOD IF PART OF A HEALTHY, BALANCED DIET, STUDY SUGGESTS
“Full-fat dairy — especially cheese, for example — tends to be associated with lower BMI, reduced rates of diabetes and even reduced dementia risk,” he told Fox News Digital. “There are, of course, nuances — but ‘ending the war’ on saturated fat seems reasonable.”
Risks vary, experts say
Experts cautioned about the potential health risks of exceeding the recommended intake of saturated fat, including higher rates of LDL “bad” cholesterol, which is known to increase the risk of cardiovascular disease.
“The recommendation to limit saturated fat to 10% of total calories is based on the research showing that higher rates increase LDL cholesterol and associated risks for cardiovascular disease,” Sherry Coleman Collins, a food allergy dietitian and expert from the Atlanta metropolitan area, told Fox News Digital.
One of the most noteworthy shifts in the 2025-2030 Dietary Guidelines for Americans is a greater emphasis on “high-quality proteins” — including red meat and eggs — as well as full-fat dairy. (iStock)
Nutrition should be personalized and is dependent on multiple factors, she said, including age, gender, activity level and genetic risk factors.
“The total saturated fat an individual might safely consume is influenced by their size and total calorie needs, as well as potentially genetic differences,” Coleman Collins said.
Norwitz agreed, adding that “the specific food source and interaction with the unique host and their broader dietary context should take the spotlight.”
Dr. Pooja Gidwani, a double board-certified doctor of internal medicine and obesity medicine in Los Angeles, pointed out that not everyone has the same “tolerance” for saturated fats.
“If increasing saturated fat leads to a meaningful rise in LDL cholesterol or ApoB (Apolipoprotein B, a protein found on the surface of certain cholesterol-carrying particles in the blood), that intake level is excessive for that individual, regardless of improvements in weight or glucose metrics,” she said.
TRUMP ADMIN’S NEW NUTRITION GUIDELINES TARGET ULTRA-PROCESSED FOODS, EASE UP ON RED MEAT AND SATURATED FATS
“This personalized approach becomes increasingly important in midlife and beyond, when cardiovascular disease becomes the dominant driver of morbidity and mortality and when tolerance for cumulative atherogenic (artery-clogging) exposure is lower.”
For those who need to reduce LDL cholesterol or have a higher cardiovascular risk, the American Heart Association recommends an even lower amount of saturated fats — less than 6% of total daily calories.
Experts cautioned about the potential health risks of exceeding the recommended intake of saturated fat, including higher rates of LDL “bad” cholesterol. (iStock)
Gidwani also cautioned that diets emphasizing saturated fat could crowd out fiber and unsaturated fats, “both of which play independent roles in cholesterol clearance, insulin sensitivity, gut health and inflammation.”
“Saturated fat-heavy patterns are also calorie-dense, which can quietly undermine long-term weight management if intake is not carefully regulated,” she added.
Not all saturated fats are equal, experts say
The effects of saturated fat depend on what specific foods are being consumed, according to experts.
“I would recommend choosing minimally processed or unprocessed forms of foods,” said Tanya Freirich, a registered dietitian nutritionist in Charlotte, North Carolina. “For example, in place of a hot dog — which has additives, nitrites, sodium and fillers — consuming a chicken thigh would be a much better choice.”
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Gidwani reiterated that the amount of processing plays a big role.
“Processed meats are consistently associated with worse cardiometabolic outcomes and represent the clearest category to limit,” she said. “The risk here is not only saturated fat, but also sodium load, preservatives and the broader dietary pattern they tend to accompany.”
“Full-fat dairy — especially cheese, for example — tends to be associated with lower BMI, reduced rates of diabetes and even reduced dementia risk,” an expert told Fox News Digital. (iStock)
Unprocessed red meat, the doctor said, can fit into an overall healthy diet in smaller amounts, particularly when consumed alongside fiber-rich plants and minimally processed foods.
“However, from a longevity perspective, it should be viewed as optional rather than foundational, especially for individuals with elevated cardiovascular risk,” she added.
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When it comes to dairy, Gidwani noted that fermented options are “metabolically more favorable” than butter or cream.
“However, saturated fat from dairy is still not necessary to prioritize for metabolic health or longevity,” she said. “Excessive reliance on dairy fat can displace healthier fat sources without offering clear long-term benefit.”
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Overall, the doctor recommends unsaturated fat sources, including extra virgin olive oil, nuts, seeds, avocado and omega-3-rich fish, as primary dietary fats.
“These consistently support lipid profiles, insulin sensitivity and vascular health,” Gidwani said. “Saturated fat can exist within a balanced diet, but it should remain secondary rather than emphasized.”
Why the big picture matters
Saturated fat is just one piece of a much wider nutrition puzzle, the experts agreed.
Unprocessed red meat can fit into an overall healthy diet in smaller amounts, particularly when consumed alongside fiber-rich plants and minimally processed foods, one expert said. (iStock)
“Our heart health is not determined by one type of fat or one type of cholesterol, but the sum of many parts — our entire diet, our exercise habits, our stress and so much more,” Freirich said.
She recommends consulting a registered dietitian for guidance on unique dietary needs based on age, gender, activity level and medical history.
“Our heart health is not determined by one type of fat or one type of cholesterol, but the sum of many parts — our entire diet, our exercise habits, our stress and so much more,” said an expert. (iStock)
New Jersey-based dietitian Erin Palinski-Wade, author of “2-Day Diabetes Diet,” added that the message should be to focus more on overall patterns.
That means “plenty of fiber-rich plants, lean protein at every meal (including those that also contain fiber, such as nuts and seeds) and a reduction in overall intake of added sugars.”
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“That change will drive true health improvements,” she said.
Health
The Wegovy Pill Is Here: See the Cost and How Much Weight You Can Lose
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Health
Missing sleep may take a hidden toll on your brain and longevity, research reveals
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Missing out on adequate sleep could be taking years off your life.
New research from the Oregon Health & Science University (OHSU), published in the journal Sleep Advances, found that poor sleep may shorten life expectancy more than other lifestyle factors like diet, exercise and loneliness.
The researchers analyzed nationwide CDC survey data, identifying trends associated with average life expectancy by county, according to a press release.
NEW HEALTH WARNING ISSUED OVER POPULAR SLEEP AID MILLIONS TAKE NIGHTLY
The study found that lack of adequate sleep led to higher mortality risk in every U.S. state and was the top behavioral driver compared to other factors, only behind smoking.
Senior study author Andrew McHill, Ph.D., associate professor and director of the Sleep, Chronobiology, and Health Laboratory in the OHSU School of Nursing, noted in a statement that he did not expect sleep to be “so strongly correlated” to life expectancy.
Poor sleep is directly correlated with shorter life expectancy, the study reveals. (iStock)
“We’ve always thought sleep is important, but this research really drives that point home: People really should strive to get seven to nine hours of sleep, if at all possible,” he said.
“This research shows that we need to prioritize sleep at least as much as we do [in] what we eat or how we exercise.”
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In a previous interview with Fox News Digital, Dr. Daniel Amen, psychiatrist and owner of Amen Clinics in California, emphasized how important sleep is for brain function and longevity.
Researchers suggest people should prioritize sleep just as much as diet and exercise. (iStock)
“Sleep is so important,” he said. “When you sleep, your brain cleans and washes itself. And if you don’t sleep seven to nine hours at night, your brain looks older than you are — there’s less blood flow, and it increases inflammation in the brain.”
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“Your brain doesn’t have enough time to get rid of the toxins that build up during the day.”
Lack of adequate sleep can lead to poor decisions and foster toxic cycles, the doctor warned.
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“If your brain has less activity in the front part, not only are you tired, but you’re also hungrier, and you’re more likely to not make the best decisions,” he said.
“Which, of course, will stress you out, and then you won’t sleep well the next night.”
A doctor suggests being “purposeful” about going to bed and waking up each day. (iStock)
One small change to promote longevity and brain health is to try getting to bed 15 minutes earlier, Amen suggested.
TEST YOURSELF WITH OUR LATEST LIFESTYLE QUIZ
“Really be purposeful about not being distracted by Netflix or your phone,” he said.
“And when you get up in the morning, say to yourself, ‘Today is going to be a great day.’ The more positive you are, the better your brain.”
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